<template>
  <div :class="getClass" ref="wrapperRef">
    <PageHeader :ghost="ghost" :title="title" v-bind="omit($attrs, 'class')" ref="headerRef" v-if="getShowHeader">
      <template #default>
        <template v-if="content">
          {{ content }}
        </template>
        <slot name="headerContent" v-else></slot>
      </template>
      <template #[item]="data" v-for="item in getHeaderSlots">
        <slot :name="item" v-bind="data || {}"></slot>
      </template>
    </PageHeader>

    <div class="overflow-hidden" :class="getContentClass" :style="getContentStyle" ref="contentRef">
      <slot></slot>
    </div>

    <PageFooter v-if="getShowFooter" ref="footerRef">
      <template #left>
        <slot name="leftFooter"></slot>
      </template>
      <template #right>
        <slot name="rightFooter"></slot>
      </template>
    </PageFooter>
  </div>
</template>
<script lang="ts" setup>
  import { computed, CSSProperties, PropType, provide, ref, unref, useAttrs, useSlots, watch } from "vue";
  import PageFooter from "./PageFooter.vue";
  import { useDesign } from "@mfish/core/hooks";
  import { propTypes } from "@mfish/core/utils/PropTypes";
  import { debounce, omit } from "lodash-es";
  import { PageHeader } from "ant-design-vue";
  import { useContentHeight } from "@/hooks/UseContentHeight";
  import { PageWrapperFixedHeightKey } from "../index";
  import { useElementSize } from "@vueuse/core";

  defineOptions({
    name: "PageWrapper",
    inheritAttrs: false
  });
  const props = defineProps({
    title: propTypes.string,
    dense: propTypes.bool.def(true),
    ghost: propTypes.bool,
    content: propTypes.string,
    contentStyle: {
      type: Object as PropType<CSSProperties>
    },
    contentBackground: propTypes.bool,
    contentFullHeight: propTypes.bool.def(false),
    contentClass: propTypes.string,
    fixedHeight: propTypes.bool,
    upwardSpace: propTypes.oneOfType([propTypes.number, propTypes.string]).def(0)
  });
  const attrs = useAttrs();
  const slots = useSlots();
  const wrapperRef = ref(null);
  const headerRef = ref(null);
  const contentRef = ref(null);
  const footerRef = ref(null);
  const { prefixCls } = useDesign("page-wrapper");
  const { height } = useElementSize(wrapperRef);
  provide(
    PageWrapperFixedHeightKey,
    computed(() => props.fixedHeight)
  );

  const getIsContentFullHeight = computed(() => {
    return props.contentFullHeight;
  });

  const getUpwardSpace = computed(() => props.upwardSpace);
  const { redoHeight, setCompensation, contentHeight } = useContentHeight(
    getIsContentFullHeight,
    wrapperRef,
    [headerRef, footerRef],
    [contentRef],
    getUpwardSpace
  );
  setCompensation({ useLayoutFooter: true, elements: [footerRef] });

  const getClass = computed(() => {
    return [
      prefixCls,
      {
        [`${prefixCls}--dense`]: props.dense
      },
      attrs.class ?? {}
    ];
  });

  const getShowHeader = computed(
    () => props.content || slots?.headerContent || props.title || getHeaderSlots.value.length > 0
  );

  const getShowFooter = computed(() => slots?.leftFooter || slots?.rightFooter);

  const getHeaderSlots = computed(() => {
    return Object.keys(omit(slots, "default", "leftFooter", "rightFooter", "headerContent"));
  });

  const getContentStyle = computed((): CSSProperties => {
    const { contentFullHeight, contentStyle, fixedHeight } = props;
    if (!contentFullHeight) {
      return { ...contentStyle };
    }

    const height = unref(contentHeight) === null ? "" : `${unref(contentHeight)}px`;
    return {
      ...contentStyle,
      minHeight: height,

      ...(fixedHeight ? { height } : {})
    };
  });

  const getContentClass = computed(() => {
    const { contentBackground, contentClass } = props;
    return [
      `${prefixCls}-content`,
      contentClass,
      {
        [`${prefixCls}-content-bg`]: contentBackground
      }
    ];
  });

  watch(
    () => [getShowFooter.value],
    () => {
      redoHeight();
    },
    {
      flush: "post",
      immediate: true
    }
  );

  const debounceRedoHeight = debounce(redoHeight, 50);
  watch(height, () => {
    const { contentFullHeight, fixedHeight } = props;
    contentFullHeight && fixedHeight && debounceRedoHeight();
  });
</script>
<style lang="less">
  @prefix-cls: ~"@{namespace}-page-wrapper";

  .@{prefix-cls} {
    position: relative;

    .@{prefix-cls}-content {
      margin: 16px;
    }

    .ant-page-header {
      &:empty {
        padding: 0;
      }
    }

    &-content-bg {
      background-color: @component-background;
    }

    &--dense {
      .@{prefix-cls}-content {
        margin: 0;
      }
    }
  }
</style>
